Crack open supporter-bulk-upgrades.php and search for "900" and replace it to your heart's content. I will add that you shouldn't add commas to your numbers here. 10000 will probably work but 10,000 won't.

Also, you're dropdown menu is gonna get ridiculously long. I'd probably have the counter start at '0' and then go up by hundreds... go from $counter += 1 to $counter += 100

I'm sure there's a better way to do it than that, but that's what I've got... If you start the counter at zero you're going to have zero as a credit option.

Also, it's worth noting that any upgrade from wpmudev will overwrite the changes you've made so make notations accordingly! (If it's a larger project, a custom wiiki is a really convenient way to do it)

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